Sintesis Komposit TiO2/Cu2O Menggunakan Metode Hidrotermal dengan Variasi Persen Massa TiO2 Terhadap Fotodegradasi Diazinon

Abstract

This research investigated and focused on the effect of TiO2 mass percent ratio on TiO2/Cu2O composite material synthesized by hydrothermal method. The mass percent ratio of TiO2 studied in this research is 0%, 20%, 35%, 50%, 65%, 80% and 100% with TiO2 micropowder and Cu(CH3COO)2.H2O as precursor. The TiO2/Cu2O composite were prepared by hydrothermal method at 100˚C for 2 hours and then characterized by XRD, SEM, XRF and UV-Vis DRS. The TiO2/Cu2O composite was investigated for photocatalytic activity by degrading diazinon compounds. The best diffraction pattern was shown by the 50% TiO2/Cu2O composite because it has the highest crystallinity, which is consistent with the anatase and cuprite crystal structures. The morphology of the TiO2/Cu2O composite is spherical, and the variation of the mass percentage of TiO2, which becomes larger, produces a smaller particle size. The elemental contents successfully detected were Ti and Cu. The variation of the mass percent of TiO2, which becomes larger, causes the number of Ti elements to increase and the number of Cu elements to decrease. The smaller TiO2 variations produce smaller band gap energy from 3.35 eV to 1.91 eV. The highest photocatalytic activity was produced by the 50% TiO2/Cu2O composite because it was able to degrade diazinon by 89.11% during an irradiation time of 180 minutes.